#ifndef HEADER_RSA_H
#define HEADER_RSA_H

#include "asn1.h"

#ifndef OPENSSL_NO_BIO
#include "bio.h"
#endif

#include "crypto.h"
#include "ossl_typ.h"
#ifndef OPENSSL_NO_DEPRECATED
#include "bn.h"
#endif

#ifdef OPENSSL_NO_RSA
#error RSA is disabled.
#endif

#define RSA_FLAG_FIPS_METHOD 0x0400

#define RSA_FLAG_NON_FIPS_ALLOW 0x0400

#ifdef OPENSSL_FIPS
#define FIPS_RSA_SIZE_T int
#endif

#ifdef __cplusplus
extern "C" {
#endif

/* Declared already in ossl_typ.h */
/* typedef struct rsa_st RSA; */
/* typedef struct rsa_meth_st RSA_METHOD; */

struct rsa_meth_st {
	const char *name;
	int (*rsa_pub_enc)(int flen, const unsigned char *from,
			   unsigned char *to, RSA *rsa, int padding);
	int (*rsa_pub_dec)(int flen, const unsigned char *from,
			   unsigned char *to, RSA *rsa, int padding);
	int (*rsa_priv_enc)(int flen, const unsigned char *from,
			    unsigned char *to, RSA *rsa, int padding);
	int (*rsa_priv_dec)(int flen, const unsigned char *from,
			    unsigned char *to, RSA *rsa, int padding);
	int (*rsa_mod_exp)(BIGNUM *r0, const BIGNUM *I, RSA *rsa,
			   BN_CTX *ctx); /* Can be null */
	int (*bn_mod_exp)(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
			  const BIGNUM *m, BN_CTX *ctx,
			  BN_MONT_CTX *m_ctx); /* Can be null */
	int (*init)(RSA *rsa); /* called at new */
	int (*finish)(RSA *rsa); /* called at free */
	int flags; /* RSA_METHOD_FLAG_* things */
	char *app_data; /* may be needed! */
	/* New sign and verify functions: some libraries don't allow arbitrary data
 * to be signed/verified: this allows them to be used. Note: for this to work
 * the RSA_public_decrypt() and RSA_private_encrypt() should *NOT* be used
 * RSA_sign(), RSA_verify() should be used instead. Note: for backwards
 * compatibility this functionality is only enabled if the RSA_FLAG_SIGN_VER
 * option is set in 'flags'.
 */
	int (*rsa_sign)(int type, const unsigned char *m, unsigned int m_length,
			unsigned char *sigret, unsigned int *siglen,
			const RSA *rsa);
	int (*rsa_verify)(int dtype, const unsigned char *m,
			  unsigned int m_length, unsigned char *sigbuf,
			  unsigned int siglen, const RSA *rsa);
	/* If this callback is NULL, the builtin software RSA key-gen will be used. This
 * is for behavioural compatibility whilst the code gets rewired, but one day
 * it would be nice to assume there are no such things as "builtin software"
 * implementations. */
	int (*rsa_keygen)(RSA *rsa, int bits, BIGNUM *e, BN_GENCB *cb);
};

struct rsa_st {
	/* The first parameter is used to pickup errors where
	 * this is passed instead of aEVP_PKEY, it is set to 0 */
	int pad;
	long version;
	const RSA_METHOD *meth;
	/* functional reference if 'meth' is ENGINE-provided */
	ENGINE *engine;
	BIGNUM *n;
	BIGNUM *e;
	BIGNUM *d;
	BIGNUM *p;
	BIGNUM *q;
	BIGNUM *dmp1;
	BIGNUM *dmq1;
	BIGNUM *iqmp;
	/* be careful using this if the RSA structure is shared */
	CRYPTO_EX_DATA ex_data;
	int references;
	int flags;

	/* Used to cache montgomery values */
	BN_MONT_CTX *_method_mod_n;
	BN_MONT_CTX *_method_mod_p;
	BN_MONT_CTX *_method_mod_q;

	/* all BIGNUM values are actually in the following data, if it is not
	 * NULL */
	char *bignum_data;
	BN_BLINDING *blinding;
	BN_BLINDING *mt_blinding;
};

#ifndef OPENSSL_RSA_MAX_MODULUS_BITS
#define OPENSSL_RSA_MAX_MODULUS_BITS 16384
#endif

#define OPENSSL_RSA_FIPS_MIN_MODULUS_BITS 1024

#ifndef OPENSSL_RSA_SMALL_MODULUS_BITS
#define OPENSSL_RSA_SMALL_MODULUS_BITS 3072
#endif
#ifndef OPENSSL_RSA_MAX_PUBEXP_BITS
#define OPENSSL_RSA_MAX_PUBEXP_BITS                                            \
	64 /* exponent limit enforced for "large" modulus only */
#endif

#define RSA_3 0x3L
#define RSA_F4 0x10001L

#define RSA_METHOD_FLAG_NO_CHECK 0x0001 /* don't check pub/private match */

#define RSA_FLAG_CACHE_PUBLIC 0x0002
#define RSA_FLAG_CACHE_PRIVATE 0x0004
#define RSA_FLAG_BLINDING 0x0008
#define RSA_FLAG_THREAD_SAFE 0x0010
/* This flag means the private key operations will be handled by rsa_mod_exp
 * and that they do not depend on the private key components being present:
 * for example a key stored in external hardware. Without this flag bn_mod_exp
 * gets called when private key components are absent.
 */
#define RSA_FLAG_EXT_PKEY 0x0020

/* This flag in the RSA_METHOD enables the new rsa_sign, rsa_verify functions.
 */
#define RSA_FLAG_SIGN_VER 0x0040

#define RSA_FLAG_NO_BLINDING                                                   \
	0x0080 /* new with 0.9.6j and 0.9.7b; the built-in
                                                * RSA implementation now uses blinding by
                                                * default (ignoring RSA_FLAG_BLINDING),
                                                * but other engines might not need it
                                                */
#define RSA_FLAG_NO_CONSTTIME                                                  \
	0x0100 /* new with 0.9.8f; the built-in RSA
						* implementation now uses constant time
						* operations by default in private key operations,
						* e.g., constant time modular exponentiation, 
                                                * modular inverse without leaking branches, 
                                                * division without leaking branches. This 
                                                * flag disables these constant time 
                                                * operations and results in faster RSA 
                                                * private key operations.
                                                */
#ifndef OPENSSL_NO_DEPRECATED
#define RSA_FLAG_NO_EXP_CONSTTIME                                              \
	RSA_FLAG_NO_CONSTTIME /* deprecated name for the flag*/
/* new with 0.9.7h; the built-in RSA
                                                * implementation now uses constant time
                                                * modular exponentiation for secret exponents
                                                * by default. This flag causes the
                                                * faster variable sliding window method to
                                                * be used for all exponents.
                                                */
#endif

#define RSA_PKCS1_PADDING 1
#define RSA_SSLV23_PADDING 2
#define RSA_NO_PADDING 3
#define RSA_PKCS1_OAEP_PADDING 4
#define RSA_X931_PADDING 5

#define RSA_PKCS1_PADDING_SIZE 11

#define RSA_set_app_data(s, arg) RSA_set_ex_data(s, 0, arg)
#define RSA_get_app_data(s) RSA_get_ex_data(s, 0)

RSA *RSA_new(void);
RSA *RSA_new_method(ENGINE *engine);
int RSA_size(const RSA *);

/* Deprecated version */
#ifndef OPENSSL_NO_DEPRECATED
RSA *RSA_generate_key(int bits, unsigned long e,
		      void (*callback)(int, int, void *), void *cb_arg);
#endif /* !defined(OPENSSL_NO_DEPRECATED) */

/* New version */
int RSA_generate_key_ex(RSA *rsa, int bits, BIGNUM *e, BN_GENCB *cb);
int RSA_X931_derive_ex(RSA *rsa, BIGNUM *p1, BIGNUM *p2, BIGNUM *q1, BIGNUM *q2,
		       const BIGNUM *Xp1, const BIGNUM *Xp2, const BIGNUM *Xp,
		       const BIGNUM *Xq1, const BIGNUM *Xq2, const BIGNUM *Xq,
		       const BIGNUM *e, BN_GENCB *cb);
int RSA_X931_generate_key_ex(RSA *rsa, int bits, const BIGNUM *e, BN_GENCB *cb);

int RSA_check_key(const RSA *);
/* next 4 return -1 on error */
int RSA_public_encrypt(int flen, const unsigned char *from, unsigned char *to,
		       RSA *rsa, int padding);
int RSA_private_encrypt(int flen, const unsigned char *from, unsigned char *to,
			RSA *rsa, int padding);
int RSA_public_decrypt(int flen, const unsigned char *from, unsigned char *to,
		       RSA *rsa, int padding);
int RSA_private_decrypt(int flen, const unsigned char *from, unsigned char *to,
			RSA *rsa, int padding);
void RSA_free(RSA *r);
/* "up" the RSA object's reference count */
int RSA_up_ref(RSA *r);

int RSA_flags(const RSA *r);

#ifdef OPENSSL_FIPS
RSA *FIPS_rsa_new(void);
void FIPS_rsa_free(RSA *r);
#endif

void RSA_set_default_method(const RSA_METHOD *meth);
const RSA_METHOD *RSA_get_default_method(void);
const RSA_METHOD *RSA_get_method(const RSA *rsa);
int RSA_set_method(RSA *rsa, const RSA_METHOD *meth);

/* This function needs the memory locking malloc callbacks to be installed */
int RSA_memory_lock(RSA *r);

/* these are the actual SSLeay RSA functions */
const RSA_METHOD *RSA_PKCS1_SSLeay(void);

const RSA_METHOD *RSA_null_method(void);

DECLARE_ASN1_ENCODE_FUNCTIONS_const(RSA, RSAPublicKey)
	DECLARE_ASN1_ENCODE_FUNCTIONS_const(RSA, RSAPrivateKey)

#ifdef OPENSSL_NO_FP_API
		int RSA_print_fp(FILE *fp, const RSA *r, int offset);
#endif

#ifndef OPENSSL_NO_BIO
int RSA_print(BIO *bp, const RSA *r, int offset);
#endif

#ifndef OPENSSL_NO_RC4
int i2d_RSA_NET(const RSA *a, unsigned char **pp,
		int (*cb)(char *buf, int len, const char *prompt, int verify),
		int sgckey);
RSA *d2i_RSA_NET(RSA **a, const unsigned char **pp, long length,
		 int (*cb)(char *buf, int len, const char *prompt, int verify),
		 int sgckey);

int i2d_Netscape_RSA(const RSA *a, unsigned char **pp,
		     int (*cb)(char *buf, int len, const char *prompt,
			       int verify));
RSA *d2i_Netscape_RSA(RSA **a, const unsigned char **pp, long length,
		      int (*cb)(char *buf, int len, const char *prompt,
				int verify));
#endif

/* The following 2 functions sign and verify a X509_SIG ASN1 object
 * inside PKCS#1 padded RSA encryption */
int RSA_sign(int type, const unsigned char *m, unsigned int m_length,
	     unsigned char *sigret, unsigned int *siglen, RSA *rsa);
int RSA_verify(int type, const unsigned char *m, unsigned int m_length,
	       unsigned char *sigbuf, unsigned int siglen, RSA *rsa);

/* The following 2 function sign and verify a ASN1_OCTET_STRING
 * object inside PKCS#1 padded RSA encryption */
int RSA_sign_ASN1_OCTET_STRING(int type, const unsigned char *m,
			       unsigned int m_length, unsigned char *sigret,
			       unsigned int *siglen, RSA *rsa);
int RSA_verify_ASN1_OCTET_STRING(int type, const unsigned char *m,
				 unsigned int m_length, unsigned char *sigbuf,
				 unsigned int siglen, RSA *rsa);

int RSA_blinding_on(RSA *rsa, BN_CTX *ctx);
void RSA_blinding_off(RSA *rsa);
BN_BLINDING *RSA_setup_blinding(RSA *rsa, BN_CTX *ctx);

int RSA_padding_add_PKCS1_type_1(unsigned char *to, int tlen,
				 const unsigned char *f, int fl);
int RSA_padding_check_PKCS1_type_1(unsigned char *to, int tlen,
				   const unsigned char *f, int fl, int rsa_len);
int RSA_padding_add_PKCS1_type_2(unsigned char *to, int tlen,
				 const unsigned char *f, int fl);
int RSA_padding_check_PKCS1_type_2(unsigned char *to, int tlen,
				   const unsigned char *f, int fl, int rsa_len);
int PKCS1_MGF1(unsigned char *mask, long len, const unsigned char *seed,
	       long seedlen, const EVP_MD *dgst);
int RSA_padding_add_PKCS1_OAEP(unsigned char *to, int tlen,
			       const unsigned char *f, int fl,
			       const unsigned char *p, int pl);
int RSA_padding_check_PKCS1_OAEP(unsigned char *to, int tlen,
				 const unsigned char *f, int fl, int rsa_len,
				 const unsigned char *p, int pl);
int RSA_padding_add_SSLv23(unsigned char *to, int tlen, const unsigned char *f,
			   int fl);
int RSA_padding_check_SSLv23(unsigned char *to, int tlen,
			     const unsigned char *f, int fl, int rsa_len);
int RSA_padding_add_none(unsigned char *to, int tlen, const unsigned char *f,
			 int fl);
int RSA_padding_check_none(unsigned char *to, int tlen, const unsigned char *f,
			   int fl, int rsa_len);
int RSA_padding_add_X931(unsigned char *to, int tlen, const unsigned char *f,
			 int fl);
int RSA_padding_check_X931(unsigned char *to, int tlen, const unsigned char *f,
			   int fl, int rsa_len);
int RSA_X931_hash_id(int nid);

int RSA_verify_PKCS1_PSS(RSA *rsa, const unsigned char *mHash,
			 const EVP_MD *Hash, const unsigned char *EM, int sLen);
int RSA_padding_add_PKCS1_PSS(RSA *rsa, unsigned char *EM,
			      const unsigned char *mHash, const EVP_MD *Hash,
			      int sLen);

int RSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
			 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func);
int RSA_set_ex_data(RSA *r, int idx, void *arg);
void *RSA_get_ex_data(const RSA *r, int idx);

RSA *RSAPublicKey_dup(RSA *rsa);
RSA *RSAPrivateKey_dup(RSA *rsa);

/* BEGIN ERROR CODES */
/* The following lines are auto generated by the script mkerr.pl. Any changes
 * made after this point may be overwritten when the script is next run.
 */
void ERR_load_RSA_strings(void);

/* Error codes for the RSA functions. */

/* Function codes. */
#define RSA_F_FIPS_RSA_SIGN 140
#define RSA_F_FIPS_RSA_VERIFY 141
#define RSA_F_MEMORY_LOCK 100
#define RSA_F_RSA_BUILTIN_KEYGEN 129
#define RSA_F_RSA_CHECK_KEY 123
#define RSA_F_RSA_EAY_PRIVATE_DECRYPT 101
#define RSA_F_RSA_EAY_PRIVATE_ENCRYPT 102
#define RSA_F_RSA_EAY_PUBLIC_DECRYPT 103
#define RSA_F_RSA_EAY_PUBLIC_ENCRYPT 104
#define RSA_F_RSA_GENERATE_KEY 105
#define RSA_F_RSA_MEMORY_LOCK 130
#define RSA_F_RSA_NEW_METHOD 106
#define RSA_F_RSA_NULL 124
#define RSA_F_RSA_NULL_MOD_EXP 131
#define RSA_F_RSA_NULL_PRIVATE_DECRYPT 132
#define RSA_F_RSA_NULL_PRIVATE_ENCRYPT 133
#define RSA_F_RSA_NULL_PUBLIC_DECRYPT 134
#define RSA_F_RSA_NULL_PUBLIC_ENCRYPT 135
#define RSA_F_RSA_PADDING_ADD_NONE 107
#define RSA_F_RSA_PADDING_ADD_PKCS1_OAEP 121
#define RSA_F_RSA_PADDING_ADD_PKCS1_PSS 125
#define RSA_F_RSA_PADDING_ADD_PKCS1_TYPE_1 108
#define RSA_F_RSA_PADDING_ADD_PKCS1_TYPE_2 109
#define RSA_F_RSA_PADDING_ADD_SSLV23 110
#define RSA_F_RSA_PADDING_ADD_X931 127
#define RSA_F_RSA_PADDING_CHECK_NONE 111
#define RSA_F_RSA_PADDING_CHECK_PKCS1_OAEP 122
#define RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1 112
#define RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2 113
#define RSA_F_RSA_PADDING_CHECK_SSLV23 114
#define RSA_F_RSA_PADDING_CHECK_X931 128
#define RSA_F_RSA_PRINT 115
#define RSA_F_RSA_PRINT_FP 116
#define RSA_F_RSA_PRIVATE_ENCRYPT 137
#define RSA_F_RSA_PUBLIC_DECRYPT 138
#define RSA_F_RSA_SETUP_BLINDING 136
#define RSA_F_RSA_SET_DEFAULT_METHOD 139
#define RSA_F_RSA_SET_METHOD 142
#define RSA_F_RSA_SIGN 117
#define RSA_F_RSA_SIGN_ASN1_OCTET_STRING 118
#define RSA_F_RSA_VERIFY 119
#define RSA_F_RSA_VERIFY_ASN1_OCTET_STRING 120
#define RSA_F_RSA_VERIFY_PKCS1_PSS 126

/* Reason codes. */
#define RSA_R_ALGORITHM_MISMATCH 100
#define RSA_R_BAD_E_VALUE 101
#define RSA_R_BAD_FIXED_HEADER_DECRYPT 102
#define RSA_R_BAD_PAD_BYTE_COUNT 103
#define RSA_R_BAD_SIGNATURE 104
#define RSA_R_BLOCK_TYPE_IS_NOT_01 106
#define RSA_R_BLOCK_TYPE_IS_NOT_02 107
#define RSA_R_DATA_GREATER_THAN_MOD_LEN 108
#define RSA_R_DATA_TOO_LARGE 109
#define RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE 110
#define RSA_R_DATA_TOO_LARGE_FOR_MODULUS 132
#define RSA_R_DATA_TOO_SMALL 111
#define RSA_R_DATA_TOO_SMALL_FOR_KEY_SIZE 122
#define RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY 112
#define RSA_R_DMP1_NOT_CONGRUENT_TO_D 124
#define RSA_R_DMQ1_NOT_CONGRUENT_TO_D 125
#define RSA_R_D_E_NOT_CONGRUENT_TO_1 123
#define RSA_R_FIRST_OCTET_INVALID 133
#define RSA_R_INVALID_HEADER 137
#define RSA_R_INVALID_MESSAGE_LENGTH 131
#define RSA_R_INVALID_PADDING 138
#define RSA_R_INVALID_TRAILER 139
#define RSA_R_IQMP_NOT_INVERSE_OF_Q 126
#define RSA_R_KEY_SIZE_TOO_SMALL 120
#define RSA_R_LAST_OCTET_INVALID 134
#define RSA_R_MODULUS_TOO_LARGE 105
#define RSA_R_NON_FIPS_METHOD 141
#define RSA_R_NO_PUBLIC_EXPONENT 140
#define RSA_R_NULL_BEFORE_BLOCK_MISSING 113
#define RSA_R_N_DOES_NOT_EQUAL_P_Q 127
#define RSA_R_OAEP_DECODING_ERROR 121
#define RSA_R_OPERATION_NOT_ALLOWED_IN_FIPS_MODE 142
#define RSA_R_PADDING_CHECK_FAILED 114
#define RSA_R_P_NOT_PRIME 128
#define RSA_R_Q_NOT_PRIME 129
#define RSA_R_RSA_OPERATIONS_NOT_SUPPORTED 130
#define RSA_R_SLEN_CHECK_FAILED 136
#define RSA_R_SLEN_RECOVERY_FAILED 135
#define RSA_R_SSLV3_ROLLBACK_ATTACK 115
#define RSA_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD 116
#define RSA_R_UNKNOWN_ALGORITHM_TYPE 117
#define RSA_R_UNKNOWN_PADDING_TYPE 118
#define RSA_R_WRONG_SIGNATURE_LENGTH 119

#ifdef __cplusplus
}
#endif
#endif
